Retu is a multi-function device found on Nokia Internet Tablets implementing at least watchdog, RTC, headset detection and power button functionality.
This patch implements a minimum functionality providing only register access functions. Signed-off-by: Aaro Koskinen <[email protected]> Cc: [email protected] --- drivers/mfd/Kconfig | 8 +++ drivers/mfd/Makefile | 1 + drivers/mfd/retu-mfd.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++ include/linux/mfd/retu.h | 20 ++++++++ 4 files changed, 143 insertions(+), 0 deletions(-) create mode 100644 drivers/mfd/retu-mfd.c create mode 100644 include/linux/mfd/retu.h diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index b1a1462..8ca1270 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -1003,6 +1003,14 @@ config MFD_PALMAS If you say yes here you get support for the Palmas series of PMIC chips from Texas Instruments. +config MFD_RETU + tristate "Support for Retu multi-function device" + select MFD_CORE + depends on I2C + help + Retu is a multi-function device found on Nokia Internet Tables + (770, N800 and N810). + endmenu endif diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 79dd22d..962ec9d 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -132,3 +132,4 @@ obj-$(CONFIG_MFD_RC5T583) += rc5t583.o rc5t583-irq.o obj-$(CONFIG_MFD_SEC_CORE) += sec-core.o sec-irq.o obj-$(CONFIG_MFD_ANATOP) += anatop-mfd.o obj-$(CONFIG_MFD_LM3533) += lm3533-core.o lm3533-ctrlbank.o +obj-$(CONFIG_MFD_RETU) += retu-mfd.o diff --git a/drivers/mfd/retu-mfd.c b/drivers/mfd/retu-mfd.c new file mode 100644 index 0000000..f0097d7 --- /dev/null +++ b/drivers/mfd/retu-mfd.c @@ -0,0 +1,114 @@ +/* + * Retu MFD driver + * + * Copyright (C) 2004, 2005 Nokia Corporation + * + * Based on code written by Juha Yrjölä, David Weinehall and Mikko Ylinen. + * Rewritten to MFD/I2C driver by Aaro Koskinen. + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file "COPYING" in the main directory of this + * archive for more details. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/mutex.h> +#include <linux/module.h> +#include <linux/mfd/core.h> +#include <linux/mfd/retu.h> +#include <linux/moduleparam.h> + +/* Registers */ +#define RETU_REG_ASICR 0x00 /* ASIC ID and revision */ +#define RETU_REG_ASICR_VILMA (1 << 7) /* Bit indicating Vilma */ + +static struct mfd_cell retu_devs[] = { + { .name = "retu-wdt" }, +}; + +int retu_read(struct retu_dev *rdev, u8 reg) +{ + return i2c_smbus_read_word_data(rdev->i2c, reg); +} +EXPORT_SYMBOL_GPL(retu_read); + +int retu_write(struct retu_dev *rdev, u8 reg, u16 data) +{ + return i2c_smbus_write_word_data(rdev->i2c, reg, data); +} +EXPORT_SYMBOL_GPL(retu_write); + +static int __devinit retu_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct retu_dev *rdev; + int ret; + + rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); + if (rdev == NULL) + return -ENOMEM; + + i2c_set_clientdata(i2c, rdev); + rdev->dev = &i2c->dev; + rdev->i2c = i2c; + + ret = retu_read(rdev, RETU_REG_ASICR); + if (ret < 0) { + dev_err(rdev->dev, "could not read Retu revision: %d\n", ret); + return -EIO; + } + + dev_info(rdev->dev, "Retu%s v%d.%d found\n", + (ret & RETU_REG_ASICR_VILMA) ? " & Vilma" : "", + (ret >> 4) & 0x7, ret & 0xf); + + ret = mfd_add_devices(rdev->dev, -1, retu_devs, ARRAY_SIZE(retu_devs), + NULL, 0); + if (ret < 0) + goto error; + + return ret; + +error: + kfree(rdev); + return ret; +} + +static int __devexit retu_remove(struct i2c_client *i2c) +{ + struct retu_dev *rdev = i2c_get_clientdata(i2c); + + mfd_remove_devices(rdev->dev); + kfree(rdev); + + return 0; +} + +static const struct i2c_device_id retu_id[] = { + { "retu-mfd", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, retu_id); + +static struct i2c_driver retu_driver = { + .driver = { + .name = "retu-mfd", + .owner = THIS_MODULE, + }, + .probe = retu_probe, + .remove = retu_remove, + .id_table = retu_id, +}; +module_i2c_driver(retu_driver); + +MODULE_DESCRIPTION("Retu MFD driver"); +MODULE_AUTHOR("Aaro Koskinen <[email protected]>"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/mfd/retu.h b/include/linux/mfd/retu.h new file mode 100644 index 0000000..e1b3600 --- /dev/null +++ b/include/linux/mfd/retu.h @@ -0,0 +1,20 @@ +/* + * Retu MFD driver interface + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file "COPYING" in the main directory of this + * archive for more details. + */ + +#ifndef __LINUX_MFD_RETU_H +#define __LINUX_MFD_RETU_H + +struct retu_dev { + struct device *dev; + struct i2c_client *i2c; +}; + +int retu_read(struct retu_dev *, u8); +int retu_write(struct retu_dev *, u8, u16); + +#endif /* __LINUX_MFD_RETU_H */ -- 1.7.2.5 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
